1. Concept Overview
Python is a high-level, interpreted programming language designed to be:
- easy to read
- easy to write
- powerful enough for real-world systems
In Python, we write instructions line by line, and Python executes them from top to bottom.
This lesson introduces:
- how Python programs start
- how output is displayed
- the basic rules Python strictly follows
2. Metal Model (How to think About it)
Think of Python as a very strict English-speaking assistant:
- It follows instructions in order
- It cares deeply about spelling and indentation
- If it doesn’t understand a line, it stops immediately and complains
Your job as a programmer is to give clear, correctly formatted instructions.
3. Your First Python Program
The simplest valid Python program:
print("Hello, World!")
What is happening here?
- print → a built-in Python function
- () → used to pass information to the function
- "Hello, World!" → a string (text data)
When this program runs, Python displays:
Hello, World!
4. The print() Function
The print() function is used to display output on the screen.
Printing Text
print("Welcome to Python")
Printing Numbers
print(10)
print(3.14)
Python understands numbers without quotes.
5. Printing Multiple Values
You can print multiple values at once:
print("Age:", 21)
print("Sum:", 10 + 5)
Python automatically separates values with a space.
6. Printing on the Same Line
By default, print() moves to a new line after execution.
You can control this using end:
print("Hello", end=" ")
print("World")
Output:
Hello World
7. Escape Characters
Escape characters allow special formatting inside strings.
print("Hello\nWorld")
print("Python\tProgramming")
print("She said \"Hello\"")
| Escape | Meaning |
|---|---|
| \n | New line |
| \t | Tab space |
| \" | Double quote |
8. Comments in Python
Comments are ignored by Python and used for humans.
# This is a comment
print("Python ignores comments")
Use comments to:
- explain logic
- document code
- temporarily disable code
9. Python Syntax Rules (Very Important)
Python is case-sensitive:
print("Hello") # Correct
Print("Hello") # Error
Python uses indentation, not braces {}.
Every statement must follow Python’s syntax exactly.
10. Common Beginner Mistakes
- Missing quotes:
print(Hello)
- Wrong brackets:
print["Hello"]
- Capitalization error:
Print("Hello")
These cause syntax errors, and the program will not run.
11. Practice Problems
Easy
- Print your name.
- Print your city.
- Print your age.
Medium
- Print the following output exactly:
Python
is
awesome
- Print:
I am learning "Python"
Thinking Practice
Fix the errors:
print("Hello World)
Print("Python")
print("Done"]
12. Mini Task
Create a console introduction card:
Name: Rahul
Age: 22
Course: Python
Rules:
Use only print()
No variables yet
13. Interview Corner
Q1. What is Python?
Expected answer:
Python is a high-level, interpreted programming language.
Q2. What does print() do?
Expected answer:
It displays output on the screen.
Q3. Is Python case-sensitive?
Expected answer:
Yes, Python is case-sensitive.
Q4. What are comments?
Expected answer:
Lines ignored by Python, used to explain code.
Q5. What type of error occurs if syntax is wrong?
Expected answer:
SyntaxError.
14. Key Takeaways
Python executes code line by line
print() displays output
Strings must be inside quotes
Python is strict about syntax and case
Errors are normal and part of learning
Next Lesson
Lesson 2 – Variables & Data Types
Top comments (1)
Very informative.. keep posting weekly. Loved your content.